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conference on radar sensor technology XVII

作者： Dogaru, Traian Liao, DaHan Le, Calvin US Army Res Lab Adelphi MD 20783 USA

ISBN: (纸本)9780819495051

This paper describes the study of a through-the-wall radar system for three-dimensional (3-D) building imaging, based on computer simulations. Two possible configurations are considered, corresponding to an airborne spotlight and a ground-based strip-map geometry. The paper details all the steps involved in this analysis: creating the computational meshes, calculating the radar signals scattered by the target, forming the radar images, and processing the images for visualization and interpretation. Particular attention is given to the scattering phenomenology and its dependence on the system geometry. The images are created via the backprojection algorithm and further processed using a constant false-alarm rate (CFAR) detector. We discuss methods of 3-D image visualization and interpretation of the results.

关键词： Sensing through-the-wall radar synthetic aperture radar computational electromagnetics

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Robotic Inspection and Subsurface Defect Mapping Using Impact-Echo and Ground Penetrating radar

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IEEE ROBOTICS AND AUTOMATION LETTERS 2023年第8期8卷 4943-4950页

作者： Hoxha, Ejup Feng, Jinglun Sanakov, Diar Xiao, Jizhong CUNY City Coll EE Dept New York NY 10031 USA NYU Mech Engn Dept New York NY 11201 USA

Concrete infrastructure often develops a variety of internal flaws that cannot be detected through visual inspection alone, and must be regularly inspected with other methods to maintain structural integrity. It has been demonstrated through previous studies that relying solely on a single non-destructive evaluation (NDE) method can be insufficient in providing a comprehensive evaluation of the structure's condition. In addition, manual NDE data collection can be labor-intensive for on-site engineers. This paper presents a robotic inspection system that uses vision-based positioning and tags NDE measurement with pose information to reveal and map subsurface defects. The system consists of three modules: 1) an Omni-directional robotic data collection platform equipped with a Realsense D435i camera for localization, an impact-echo (IE) sensor, and a ground penetrating radar (GPR), to perform automatic NDE data collection;2) an IE data processing module that utilizes both learning-based and classical methods to interpret the IE data and reveal subsurface objects;3) a GPR data processing module to reconstruct underground targets and create a 3D map for better visualization. Field testing demonstrates that the robotic system significantly increases the data collection speed, and the correlation of findings from both IE and GPR sensors give a comprehensive evaluation of concrete structures that will benefit the inspection and maintenance industry of civil infrastructure.

关键词： Robotics and automation in construction sensor-based control sensor fusion

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3D radar Imaging Using Interferometric ISAR 22

3D Radar Imaging Using Interferometric ISAR

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conference on radar sensor technology XXII

作者： Goyette, Thomas M. Dickinson, Jason C. Wetherbee, Ryan H. Cook, Jason D. Gatesman, Andrew J. Nixon, William E. Univ Massachusetts Lowell Submillimeter Wave Technol Lab 175 Cabot St Lowell MA 01854 USA US Army Natl Ground Intelligence Ctr 2055 Boulders Rd Charlottesville VA 22911 USA

ISBN: (纸本)9781510617780

Three-dimensional radar imaging is becoming increasingly important in modern warfare systems, leading to an increased need for deeper understanding of the 3D scattering behavior of targets as simple as a cylinder, to as complex as a main battle tank or air defense unit. Fully polarimetric, three dimensional radar signature data have been collected using 1/16th scale models of tactical targets in several indoor compact radar ranges, corresponding to data from S -band to W -band. ISAR image pairs, collected at slightly different elevations, were interferometrically processed into 3D imagery. The data collection, analysis, and 3D visualization methods are presented. Additionally, the results of mathematical 3D correlation are described. A detailed analysis of both measured and predicted 3D radar data on the UMass Lowell nominal rocket simulator target will be presented.

关键词： Sub-millimeter radar Imagery Modeling 3D Terahertz Interferometric

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Combing Transformer with Convolutional Neural Networks for radar Object Detection in millimeter-wave imaging systems 16

Combing Transformer with Convolutional Neural Networks for R...

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16th International conference on Microwave and Millimeter Wave technology (ICMMT)

作者： Wu, Bochuan Zhuge, Xiaodong Beihang Univ Sch Elect & Informat Engn Beijing 100191 Peoples R China

ISBN: (数字)9798350389968

ISBN: (纸本)9798350389968

Millimeter-wave radar is widely utilized in autonomous driving vehicles and driver assistance systems for distance and speed measurements. radar data provides valuable target perception information, such as distance, velocity, and angle, which may not be readily discernible using visual camera systems. Moreover, millimeter-wave radar is unaffected by weather or lighting conditions, offering high reliability. While conventional distance detection radars are well-established for vehicle detection, there is a lack of effective methods for extracting information from the high-dimensional data of millimeter-wave imaging systems. To address this problem, a new deep-learning model is proposed for millimeter-wave radar target detection. The model combines convolutional neural network and transformer in order to effectively extract and process data for target recognition, while balancing accuracy, real-time performance, and computational efficiency. The evaluation of proposed model on the CRUW datasets, containing camera and radar data from various driving scenarios, demonstrates its effectiveness in radar image target detection. This study contributes a more practical solution for 4D radar image processing and explores new training techniques for further developments.

关键词： visualization Computational modeling radar detection Object detection radar imaging Millimeter wave radar Transformers

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High-performance 3D-imaging laser sensor 4

High-performance 3D-imaging laser sensor

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conference on Laser radar technology and Applications IV

作者： Ullrich, A Reichert, R Studnicka, N Riegl, J RIEGL Laser Measurement Systems GmbH (Austria)

ISBN: (纸本)0819431818

A 3D imaging laser sensor is presented providing rapid acquisition of 3D data of naturally reflecting objects. The sensor is of a rugged and compact design, is eye-safe, and can be used even in adverse environmental conditions for a wide range of applications. The sensor makes use of high-speed laser ranging based on the time-of-flight method with pulsed laser diodes and of mechanically scanning the laser beam and the optical axis of the rangefinder's receiver. The maximum achievable range to non-co-operative targets is up to 350 m. The field-of-view of the sensor is settable by software commands and can be up to 80 degrees x 340 degrees with an angular resolution of the scanning mechanism of up to 0.018 degrees. data are provided at a standard parallel interface allowing easy integration with any standard PC based system for data visualization and data processing. The primary data include for each independent range measurement the co-ordinates in the sensor's local polar co-ordinate system, and the intensity of the received laser pulse to provide information on target's reflectivity. These data are provided with an average data rate up to 8000 measurements per second. A PC based acquisition program allows on-line color-encoded visualization, data storage, and data export as ASCII data, VRML data, and other widely used formats. data acquired with the sensor are presented and accuracy and ranging capability are discussed.

关键词： 3D data acquisition 3D range image sensor 3D images virtual reality

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Interferometric acquisition and fire control radar for short range missile defense with optimized radar distribution (SWORD)

Interferometric acquisition and fire control radar for short...

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conference on radar sensor technology and data visualization

作者： Smith, RA Shipman, M Holder, EJ Williams, JK USA Space & Missile Def Command Huntsville AL 35807 USA

ISBN: (纸本)0819444944

The United States Army Space and Missile Defense Command (USASMDC has interest in a technology demonstration that capitalizes on investment in fire control and smart interceptor technologies that have matured beyond basic research. The concept "SWORD" (Short range missile defense With Optimized radar Distribution) consists of a novel approach utilizing a missile interceptor and interferometric fire control radar. A hit-to-kill, closed-loop, command guidance scheme is planned that takes advantage of extremely accurate target and interceptor state vectors derived via the fire control radar. The fire control system has the capability to detect, track, and classify multiple threats in a tactical regime as well as simultaneously provide command guidance updates to multiple missile interceptors. The missile interceptor offers a cost reduction potential as well as an enhancement to the kinematics range and lethality over existing SHORAD systems. Additionally, the Radio Frequency (RF) guidance scheme offers increased battlefield weather performance. The Air Defense (AD) community, responding to current threat capabilities and trends, has identified an urgent need to have a capability to counter proliferated, low cost threats with a low cost-per-kill weapon system. The SWORD system will offer a solution that meets this need. The SWORD critical technologies will be identified including a detailed description of each. Validated test results and basic principles of operation will be presented to prove the merit of the past investments. The Deputy Assistant Secretary of the Army for Research and technology (DAS(R&T) has a three-year Science and technology Program to evaluate the errors and proposed mitigation techniques associated with target spectral dispersion and range gate straddle. Preliminary Bench-Top Experiment results will be presented in this paper.

关键词： radar Interferometry Missiles Antennas Phase measurement Interferometers Defense and security Rockets sensors Control systems

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An ultra-wideband through-wall radar for detecting the motion of people in real time

An ultra-wideband through-wall radar for detecting the motio...

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conference on radar sensor technology and data visualization

作者： Nag, S Barnes, MA Payment, T Holladay, GW Time Domain Corp Huntsville AL 35806 USA

ISBN: (纸本)0819444944

Law enforcement officers and search-and-rescue workers often face the difficult task of determining the locations of people inside a building or obscured by smoke and debris. To address this problem, Time Domain Corporation (TDC) has developed a real-time, hand-held radar to detect the motion of persons in range and azimuth through non-metallic walls. This radar is a time modulated ultra-wide band (TM-UWB) impulse radar that generates a two-dimensional (213) representation of moving targets in real time. The intentional transmit power emitted from the radar is comparable to the FCC Part 15, Class B limits. It has the following benefits: (1) covertness because of its ultra-low power noise-like signal, (2) high resolution at low radio frequencies for penetrating building materials, (3) reduced range ambiguities and clutter fold-over because of pseudo-random time modulation, and (4) clutter rejection because of the ultra-wide bandwidth of the signal. In this paper, an outline of the key parameters of the TDC prototype radar radarVision2000(TM) (RV2000) and a brief description of the algorithm that generates a motion map showing the range and direction of the moving people are presented. Some typical radar images of multiple targets for a variety of building materials and cluttered environment obtained using the prototype are shown. Finally, the paper presents some preliminary results for resolving the targets in the elevation plane alone, with a processing technique for reducing the intensity of multi-path responses in the images.

关键词： RV2000 ultra-wideband radar impulse hand-held real-time

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The rapid terrain visualization interferometric synthetic aperture radar sensor

The rapid terrain visualization interferometric synthetic ap...

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conference on Earth Observing Systems VIII

作者： Graham, RH Bickel, DL Hensley, WH Sandia Natl Labs Albuquerque NM 87185 USA

ISBN: (纸本)0819450243

The Rapid Terrain visualization interferometric synthetic aperture radar was designed and built at Sandia National Laboratories as part of an Advanced Concept technology Demonstration (ACTD) to "demonstrate the technologies and infrastructure to meet the Army requirement for rapid generation of digital topographic data to support emerging crisis C C, C or contingencies". This sensor is currently being operated by Sandia National Laboratories for the Joint Precision Strike Demonstration (JPSD) Project Office to provide highly accurate digital elevation models (DEMs) for military and civilian customers, both inside and outside of the United States. The sensor achieves better than DTED Level IV position accuracy in near real-time. The system is being flown on a deHavilland DHC-7 Army aircraft. This paper outlines some of the technologies used in the design of the system, discusses the performance, and will discuss operational issues. In addition, we will show results from recent flight tests, including high accuracy maps taken of the San Diego area.

关键词： real-time interferometric synthetic aperture radar

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DISCUSSING MILLIMETER WAVE PENCIL BEAM radar FOR TERRAIN visualization

DISCUSSING MILLIMETER WAVE PENCIL BEAM RADAR FOR TERRAIN VIS...

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IEEE/AIAA 30th Digital Avionics Systems conference (DASC) on Closing the Generation Gap - Increasing Capability for Flight Operations among Legacy, Modern and Uninhabited Aircraft

作者： Schmerwitz, Sven Peinecke, Niklas Doehler, Ulli Lueken, Thomas Korn, Bernd German Aerospace Center (DLR) Institute of Flight Guidance Germany

ISBN: (纸本)9781612847986

The DLR project ALLFlight (Assisted Low Level Flight and Landing on Unprepared Landing Sites) is devoted to demonstrating and evaluating the characteristics of sensors for helicopter operations in degraded visual environments. To successfully enhance the pilots abilities to control a helicopter in brown-out technologies are inspected that penetrate the blocked vision. Millimeter wave radar may provide the best dust penetration capabilities, however it delivers a lower angular resolution compared to other sensors. Efforts been made to simulate different sensor technologies. Among those a millimeter wave pencil beam radar simulation was implemented. In cooperation with the NRC, flight tests on a Bell 205 were conducted to gather sensor data from a 35 GHz pencil beam radar for terrain mapping, obstacle detection and dust penetration in order to highlight the capabilities of this sensor. In this paper preliminary results from the terrain mapping flight trials at NRC are presented and a description of the radar's general capability is shown. A discussion reflects the authors' opinion about effective usage of millimeter wave radar technology in degraded visual environments.

关键词： degraded vision brownout enhanced vision millimeter-wave radar flight test terrain mapping sensor fusion sensor simulation

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IFSAR for the rapid terrain visualization demonstration

IFSAR for the rapid terrain visualization demonstration

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34th Asilomar conference on Signals, Systems, and Computers

作者： Burns, BL Eichel, PH Hensley, WH Kim, TJ Sandia Natl Labs Albuquerque NM 87185 USA

ISBN: (纸本)0780365143

The Rapid Terrain visualization Advanced Concept technology Demonstration (RTV-ACTD) is designed to "demonstrate the technologies and infrastructure to meet the Army requirement for rapid generation of digital topographic data to support emerging crisis or contingencies". The primary sensor for this mission is an interferometric synthetic aperture radar (IFSAR) designed at Sandia National Laboratories. This paper will outline the design of the system and its performance, and show some recent flight test results. The RTV IFSAR will meet DTED level III and IV specifications by using a multiple-baseline design and high-accuracy differential and carrier-phase GPS navigation. It includes innovative near-real-time DEM production on-board the aircraft. The system is being flown on a deHavilland DHC-7 Army aircraft.

关键词： radar imaging

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